there's also a nasty stomach bug called the norovirus that's also on the rise. the fight against this particularly nasty strain of flu is quickly becoming an uphill battle. >> i don't remember seeing anything like this here in 20 years. >> reporter: this morning, hospitals and doctors offices are running low on flu shots and tests. >> this is a true national shortage. >> reporter: more than 128 million vaccine doses have been distributed nationwide. but with supplies dwindling, clinics can't keep up with demand. >> today, we should be getting in possibly 30 doses at this location, but that could be gone in 20 minutes. >> reporter: across the country, schools are reporting hundreds of students out sick. as some school systems, resort to using high-powered disinfectant to clean classrooms. today in oklahoma, one district has even canceled classes. 25% of its students are ill. from minnesota to massachusetts, states are reporting an increasing number of flu deaths. in new york alone, more than 15,000 cases of the virus have already been reported. more than three-ti